共查询到19条相似文献,搜索用时 62 毫秒
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利用三轴粒子-转子模型计算了193Tl超形变带γ跃迁能量,运动学转动惯量J(1)和动力学转动惯量J(2),并与实验值进行比较得到了满意的结果;预言了B(M1)值以及动力学电四极矩Q(1)和Q(2)指出在超形变带的分析中粒子-转子模型是一种可以采用的方法. 相似文献
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利用三轴粒子-转子模型计算了(193)Tl超形变带γ跃迁能量,运动学转动惯量J(1)和动力学转动惯量J(2),并与实验值进行比较得到了满意的结果;预言了B(M1)值以及动力学电四极矩Q(1)和Q(2)指出在超形变带的分析中粒子-转子模型是一种可以采用的方法. 相似文献
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为处理超变形核的转动谱,提出了一个简单的转动模型,即:冻结振动自由度,把超变形核看成是一个刚性转子.将转动哈密顿量在轴对称陀螺波函数所张开的空间中对角化时,进一步考虑了Signature为好量子数,重新计算了A~190区偶偶核的超变形带,自旋指定与ab公式自旋指定仍然一致.并计算了A~150区152Dy的超变形带,结果也与实验值拟合得很好,但自旋指定与ab公式差异较大.To deal with the SD bands, a single rotational model is proposed, i . e. freeze the degree of vibrational freedom, and regard the SD nuclei as a rigid rotor. Also, the Signature is considered to be a good quantum number . 10 SD bands were calculated, all of the assigned nuclear spins are equal to those determined by ab formula. 190 Hg and 152 Dy were also calculated, but the results of assigned nuclear spins are different to the ones of ab formula. 相似文献
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用组态相关推转Nilsson-Strutinsky模型研究了38K, 36Ar, 32,34S和35Cl的超形变转动带结构性质. 对一些特殊的近转晕线组态的性质做了较为详细的探讨并预言了其带终止态的自旋值, 尤其是预言了38K有利于实验测量到超形变带终止态的自旋值为19h, 而其四极形变值达ε2~0.50. 36Ar的理论计算与实验结果较好的一致表明这些预言结果是较可靠的. 相似文献
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用Bohr-Mottelson的两参数、三参数和四参数公式对A~190区61条超形变带进行了系统分析。结果显示:3个公式都能较好地拟合190区超形变带的E2跃迁谱,而且带自旋的确定基本一致。大部分带Bohr-Mottelson的三参数数值关系符合ab公式的理论预期值,小部分带的三参数值关系符合Harris公式的理论预期值,一半以上带的四参数数值关系与ab公式的预期值接近,而与Harris公式的预期 相似文献
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通过对正常形变基态转动带的研究,检验了用W-Z公式确定超形变带头角动量的方法,并与超形变带进行了对比.指出只要W-Z公式能很好地描述转动带(正常形变和超形变),同时跃迁能量灵敏地依赖于指定的角动量,由此确定的带头角动量都是正确的. 相似文献
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首先概述了对A≈150区超形变带的自旋指定的进展情况, 到目前为止, 所提出的各种方法对该区超形变带自旋值的指定并不一致. 发现了该区超形变带的实验能谱特性和动力学转动惯量的特性. 并将此特性用于指定A≈150区超形变带的自旋. 相似文献
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A.S. Shalaby 《理论物理通讯》2004,41(3):454-460
The dynamical moment of inertia is estimated with its even-power
expansion of the rotational frequency and in accordance we determine the
intermediate spins of the superdeformed (SD) rotational bands. Using
Marquardt method of nonlinear least-squares routines, we determine the
expansion coefficients by fitting the proposed dynamical moment of inertia
with its recent experimental data of the SD nuclei in the A=190 mass region.
The comparison between our theoretical and available experimental data for
the dynamic moment of inertia and spin shows good agreements.
Also, we have calculated the static moment of inertia at three alternative
values of spin. The value of spin at which the two moments of inertia are
nearly equals is to be regarded as a bandhead spin of the corresponding
band. These studies are carried out for eighteen bands of odd-A nuclei of
the superdeformed region 190, namely 189Hg(b1), 191Hg(b1, b2, b3,
b4), 193Hg(b2, b3, b5), 195Hg(b1, b2, b3, b4), 193Tl(b1, b2,
b3, b5), 189Tl(b1), and 197Bi(b1). We also notice the occurrence
of identical SD bands with near identical transition energies among the
considered SD bands. 相似文献
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In the cases with and without a perturbation possessing the S0sdg(5) (or SUsdg(5)) symmetry in the supersymmetry scheme with many-body interactions, superdeformed bands in the odd-A Lu isotopes 163,165,167Lu are investigated. Quantitatively good results of γ-ray energies and dynamical moments of inertia are obtained in both of the two cases. It shows that the supersymmetry scheme with many-body interactions has almost the same power to describe the triaxial superdeformed bands as to the other superdeformed bands. 相似文献
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With the supersymmetry scheme including many-body interactions, the global property and the △I = 4bifurcation in the superdeformed (SD) bands of odd-odd nuclei in A ~ 150 mass region are investigated systematically.Good results for the γ-ray energies, the dynamical moments of inertia, and energy differences △ Eγ - △ Erefγ are obtained.It shows that this approach is quite powerful in describing not only the SD bands in even-even and odd-A nuclei butalso those in odd-odd nuclei in the mass region. 相似文献
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简述了若干转动谱理论及其对超形变带的应用 ,并用 Bohr- Mottelson的 I(I+1 )展开公式分析了 A=1 90区超形变带的性质和指定了它们的能级自旋 ,用 Harris的ω2 展开公式 J(1) =2α+(4/3 )βω2 +(6 /5 )γω4分析了 A=1 5 0区 Tb和 Dy同位素 2 0条超形变带的性质 ,指定了它们的能级自旋 .对于首次发现的152 Dy(1 )超形变带 ,带首自旋指定为 2 6 h,与实验结果更加符合. The recent developments of rotational spectral theories and its application to superdeformed bands were briefly reviewed. The superdeformed bands in A ≈190 region were analyzed and the spins of energy level were determined by the least square fitting experimental transition energy with the formula of Bohr Mottelson’s I(I+1) expansions. The superdeformed bands in A ≈150 region were analyzed by using the kinematic moments of inertia formula J (1) =2α+(4/3)βω 2+(6/5)γω 4 in... 相似文献
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The experimental rotational spectra of the deformed nuclei available
in even-even and odd-A nuclei in the rare-earth and actinide regions
are systematically analyzed with several rotational spectra formulas, including Bohr-Mottelson's I(I+1)-expansion, Harris' ω2-expansion, ab and abc formulas. It is shown that the simple 2-parameter ab formula is much better than the widely used 2-parameter Bohr-Mottelson's AB formula and Harris'αβ formula. The available data of the rotational spectra of both ground-state band in even-even nuclei and one-quasiparticle band in odd-A nuclei can be conveniently and rather accurately reproduced by ab formula and abc formula. The moment of inertia and the variation with rotational frequency of angular momentum can be satisfactorily reproduced by ab and abc formulas. 相似文献